This is an excellent lens. We (the LensGiant staff) use one often for portraits and sports. Portraits look natural and the backgrounds can have a soft and pleasing blur. Using a longer lens for portraits works well outdoors because it gives more control over the background. If action shots are what you're after, the combination of focal length and large f/2 aperture size make this an ideal choice for indoor sports such as hockey, gymnastics, basketball, etc. Sports venues often have poor light which presents a challenge when you need a very fast shutter speed to stop the action. This f/2 lens gathers twice as much light as an f/2.8 lens, and it's smaller than 70-200mm lenses. We usually use this lens along with other prime lenses when covering a game. Stand along the baseline and use the shorter prime during the first half to get some action under the boards, then use the 135mm during the second half to bring the mid-court action a little closer.